more than 30 million people infected with aids around the world, spikes in cases being seen in eastern europe, asia, africa and the united states. >> it's important to know that the fight against hiv in the united states is far from over. particularly in populations like young, gay, bisexual and who men who have sex with men, they are the most affected. >> reporter: she said a major concern in the united states is many of those infected don't know it. that's why the cdc is working along with local health departments to educate and support those who need it. >> the fact we do have treatments available, that's very important. its key also to talk about activitying because if individuals are not aware of their status they can't be linked to the treatment center, they can't protect their own health and the health of those they love. >> reporter: the president reinforced the united states commitment to prevent the spread of aids and help end the pandemic. in new york. >> hundreds had to be evacuated after a train derailed on a new jersey bridge. the accident caused more than 12,000-gallons of chem